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			<h1>XPath、XQuery 以及 XSLT <span class="color_h1">函数</span>函数参考手册</h1>
<hr>
<p class="intro">下面的参考手册定义了XPath 2.0，XQuery 1.0和XSLT 2.0中的函数。</p>
<hr>
<h1>函数参考手册</h1>
<table border="0"><tr>
<td>
<ul>
<li><a href="#accessor">存取</a></li>
<li><a href="#error">错误和跟踪</a></li>
<li><a href="#numeric">数值</a></li>
<li><a href="#string">字符串</a></li>

</ul>
</td>
<td>
<ul>
<li><a href="#anyuri">AnyURI</a></li>
<li><a href="#boolean">逻辑</a></li>
<li><a href="#datetime">持续时间/日期/时间</a></li>
<li><a href="#qname">QName</a></li>
</ul>
</td>
<td>
<ul>
<li><a href="#node">节点</a></li>
<li><a href="#sequence">序列</a></li>
<li><a href="#context">Context</a></li>

</ul>
</td>
</tr></table>
<p><img decoding="async" src="/images/lamp.gif" alt="Note"> 函数命名空间的默认前缀为 fn:</p>
<p><img decoding="async" src="/images/lamp.gif" alt="Note"> 函数命名空间的 URI为 : http://www.w3.org/2005/xpath-functions</p>

<h3><a id="accessor">存取函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:node-name(node)</td>
<td>返回参数节点的节点名称。</td>
</tr>

<tr>
<td>fn:nilled(node)</td>
<td>返回是否拒绝参数节点的布尔值。</td>
</tr>

<tr>
<td>fn:data(item.item,...)</td>
<td>接受项目序列，并返回原子值序列。</td>
</tr>

<tr>
<td>
<ul><li>fn:base-uri()</li>
<li>fn:base-uri(node)</li></ul></td>
<td>返回当前节点或指定节点的 base-uri 属性的值。</td>
</tr>

<tr>
<td>fn:document-uri(node)</td>
<td>返回指定节点的 document-uri 属性的值。</td>
</tr>
</table>




<h3><a id="error">错误和跟踪函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>
<ul>
<li>fn:error()</li>
<li>fn:error(error)</li>
<li>fn:error(error,description)</li>
<li>fn:error(error,description,error-object)</li>
</ul>
</td>
<td>
<p>例子：error(fn:QName('http://example.com/test', 'err:toohigh'), 'Error: Price is too high')</p>
<p>结果：向外部处理环境返回 http://example.com/test#toohigh 以及字符串 &quot;Error: Price is too high&quot;。</p>
</td>
</tr>

<tr>
<td>fn:trace(value,label)</td>
<td>用于对查询进行 debug。</td>
</tr>
</table>



<h3><a id="numeric">有关数值的函数</a></h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:number(arg)</td>
<td>
<p>返回参数的数值。参数可以是布尔值、字符串或节点集。</p>
<p>例子：number('100')</p>
<p>结果：100</p>
</td>
</tr>

<tr>
<td>fn:abs(num)</td>
<td>
<p>返回参数的绝对值。</p>
<p>例子：abs(3.14)</p>
<p>结果：3.14</p>

<p>例子：abs(-3.14)</p>
<p>结果：3.14</p>
</td>
</tr>

<tr>
<td>fn:ceiling(num)</td>
<td>
<p>返回大于 num 参数的最小整数。</p>
<p>例子：ceiling(3.14)</p>
<p>结果：4</p>
</td>
</tr>

<tr>
<td>fn:floor(num)</td>
<td>
<p>返回不大于 num 参数的最大整数。</p>
<p>例子：floor(3.14)</p>
<p>结果：3</p>
</td>
</tr>

<tr>
<td>fn:round(num)</td>
<td>
<p>把 num 参数舍入为最接近的整数。</p>
<p>例子：round(3.14)</p>
<p>结果：3</p>
</td>
</tr>

<tr>
<td>fn:round-half-to-even()</td>
<td>
<p>例子：round-half-to-even(0.5)</p>
<p>结果：0 </p>

<p>例子：round-half-to-even(1.5)</p>
<p>结果：2</p>

<p>例子：round-half-to-even(2.5)</p>
<p>结果：2</p>
</td>
</tr>
</table>




<h3><a id="string">有关字符串的函数</a></h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:string(arg)</td>
<td>
<p>返回参数的字符串值。参数可以是数字、逻辑值或节点集。</p>
<p>例子：string(314)</p>
<p>结果：&quot;314&quot;</p>
</td>
</tr>

<tr>
<td>fn:codepoints-to-string(int,int,...)</td>
<td>
<p>根据代码点序列返回字符串。</p>
<p>例子：codepoints-to-string(84, 104, 233, 114, 232, 115, 101)</p>
<p>结果：'Thérèse'</p>
</td>
</tr>

<tr>
<td>fn:string-to-codepoints(string)</td>
<td>
<p>根据字符串返回代码点序列。</p>
<p>例子：string-to-codepoints(&quot;Thérèse&quot;)</p>
<p>结果：84, 104, 233, 114, 232, 115, 101</p>
</td>
</tr>

<tr>
<td>fn:codepoint-equal(comp1,comp2)</td>
<td>根据 Unicode 代码点对照，如果 comp1 的值等于 comp2 的值，则返回 true。(http://www.w3.org/2005/02/xpath-functions/collation/codepoint)，否则返回 false。</td>
</tr>

<tr>
<td>
<ul>
<li>fn:compare(comp1,comp2)</li>
<li>fn:compare(comp1,comp2,collation)</li>
</ul>
</td>
<td>
<p>如果 comp1 小于 comp2，则返回 -1。如果 comp1 等于 comp2，则返回 0。如果 comp1 大于 comp2，则返回 1。（根据所用的对照规则）。</p>
<p>例子：compare('ghi', 'ghi')</p>
<p>结果：0</p>
</td>
</tr>

<tr>
<td>fn:concat(string,string,...)</td>
<td>
<p>返回字符串的拼接。</p>
<p>例子：concat('XPath ','is ','FUN!')</p>
<p>结果：'XPath is FUN!'</p>
</td>
</tr>

<tr>
<td>fn:string-join((string,string,...),sep)</td>
<td>
<p>使用 sep 参数作为分隔符，来返回 string 参数拼接后的字符串。</p>
<p>例子：string-join(('We', 'are', 'having', 'fun!'), ' ')</p>
<p>结果：' We are having fun! '</p>

<p>例子：string-join(('We', 'are', 'having', 'fun!'))</p>
<p>结果：'Wearehavingfun!'</p>

<p>例子：string-join((), 'sep')</p>
<p>结果：''</p>
</td>
</tr>

<tr>
<td>
<ul>
<li>fn:substring(string,start,len)</li>
<li>fn:substring(string,start)</li>
</ul>
</td>
<td>
<p>返回从 start 位置开始的指定长度的子字符串。第一个字符的下标是 1。如果省略 len 参数，则返回从位置 start 到字符串末尾的子字符串。</p>
<p>例子：substring('Beatles',1,4)</p>
<p>结果：'Beat'</p>

<p>例子：substring('Beatles',2)</p>
<p>结果：'eatles'</p>
</td>
</tr>

<tr>
<td>
<ul>
<li>fn:string-length(string)</li>
<li>fn:string-length()</li>
</ul>
</td>
<td>
<p>返回指定字符串的长度。如果没有 string 参数，则返回当前节点的字符串值的长度。</p>
<p>例子：string-length('Beatles')</p>
<p>结果：7</p>
</td>
</tr>

<tr>
<td>
<ul>
<li>fn:normalize-space(string)</li>
<li>fn:normalize-space()</li>
</ul>
</td>
<td>
<p>删除指定字符串的开头和结尾的空白，并把内部的所有空白序列替换为一个，然后返回结果。如果没有 string 参数，则处理当前节点。</p>
<p>例子：normalize-space(' The&nbsp;&nbsp;&nbsp;XML ')</p>
<p>结果：'The XML'</p>
</td>
</tr>

<tr>
<td>fn:normalize-unicode()</td>
<td>执行 Unicode 规格化。</td>
</tr>

<tr>
<td>fn:upper-case(string)</td>
<td>
<p>把 string 参数转换为大写。</p>
<p>例子：upper-case('The XML')</p>
<p>结果：'THE XML'</p>
</td>
</tr>

<tr>
<td>fn:lower-case(string)</td>
<td>
<p>把 string 参数转换为小写。</p>
<p>例子：lower-case('The XML')</p>
<p>结果：'the xml'</p>
</td>
</tr>

<tr>
<td>fn:translate(string1,string2,string3)</td>
<td>
<p>把 string1 中的 string2 替换为 string3。</p>
<p>例子：translate('12:30','30','45')</p>
<p>结果：'12:45'</p>


<p>例子：translate('12:30','03','54')</p>
<p>结果：'12:45'</p>

<p>例子：translate('12:30','0123','abcd')</p>
<p>结果：'bc:da'</p>
</td>
</tr>

<tr>
<td>fn:escape-uri(stringURI,esc-res)</td>
<td>
<p>例子：escape-uri(&quot;http://example.com/test#car&quot;, true())</p>
<p>结果：&quot;http%3A%2F%2Fexample.com%2Ftest#car&quot;</p>
<p>例子：escape-uri(&quot;http://example.com/test#car&quot;, false())</p>
<p>结果：&quot;http://example.com/test#car&quot;</p>

<p>例子：escape-uri (&quot;http://example.com/~bébé&quot;, false())</p>
<p>结果：&quot;http://example.com/~b%C3%A9b%C3%A9&quot;</p>
</td>
</tr>

<tr>
<td>fn:contains(string1,string2)</td>
<td>
<p>如果 string1 包含 string2，则返回 true，否则返回 false。</p>
<p>例子：contains('XML','XM')</p>
<p>结果：true</p>
</td>
</tr>

<tr>
<td>fn:starts-with(string1,string2)</td>
<td>
<p>如果 string1 以 string2 开始，则返回 true，否则返回 false。</p>
<p>例子：starts-with('XML','X')</p>
<p>结果：true</p>
</td>
</tr>

<tr>
<td>fn:ends-with(string1,string2)</td>
<td>
<p>如果 string1 以 string2 结尾，则返回 true，否则返回 false。</p>
<p>例子：ends-with('XML','X')</p>
<p>结果：false</p>
</td>
</tr>

<tr>
<td>fn:substring-before(string1,string2)</td>
<td>
<p>返回 string2 在 string1 中出现之前的子字符串。</p>
<p>例子：substring-before('12/10','/')</p>
<p>结果：'12'</p>
</td>
</tr>

<tr>
<td>fn:substring-after(string1,string2)</td>
<td>
<p>返回 string2 在 string1 中出现之后的子字符串。</p>
<p>例子：substring-after('12/10','/')</p>
<p>结果：'10'</p>
</td>
</tr>

<tr>
<td>fn:matches(string,pattern)</td>
<td>
<p>如果 string 参数匹配指定的模式，则返回 true，否则返回 false。</p>
<p>例子：matches(&quot;Merano&quot;, &quot;ran&quot;)</p>
<p>结果：true</p>
</td>
</tr>

<tr>
<td>fn:replace(string,pattern,replace)</td>
<td>
<p>把指定的模式替换为 replace 参数，并返回结果。</p>
<p>例子：replace(&quot;Bella Italia&quot;, &quot;l&quot;, &quot;*&quot;)</p>
<p>结果：'Be**a Ita*ia'</p>

<p>例子：replace(&quot;Bella Italia&quot;, &quot;l&quot;, &quot;&quot;)</p>
<p>结果：'Bea Itaia'</p>
</td>
</tr>

<tr>
<td>fn:tokenize(string,pattern)</td>
<td>
<p>例子：tokenize(&quot;XPath is fun&quot;, &quot;\s+&quot;)</p>
<p>结果：(&quot;XPath&quot;, &quot;is&quot;, &quot;fun&quot;)</p>
</td>
</tr>
</table>




<h3><a id="anyuri">针对 anyURI 的函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:resolve-uri(relative,base)</td>
<td>&nbsp;</td>
</tr>
</table>




<h3><a id="boolean">关于布尔值的函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:boolean(arg)</td>
<td>返回数字、字符串或节点集的布尔值。</td>
</tr>

<tr>
<td>fn:not(arg)</td>
<td>
<p>首先通过 boolean() 函数把参数还原为一个布尔值。如果该布尔值为 false，则返回 true，如果该布尔值为 true，则返回 false。</p>
<p>例子：not(true())</p>
<p>结果：false</p>
</td>
</tr>

<tr>
<td>fn:true()</td>
<td>
<p>返回布尔值 true。</p>
<p>例子：true()</p>
<p>结果：true</p>
</td>
</tr>

<tr>
<td>fn:false()</td>
<td>
<p>返回布尔值 false。</p>
<p>例子：false()</p>
<p>结果：false</p>
</td>
</tr>
</table>
 



<h3><a id="datetime">有关持续时间、日期和时间的函数</a></h3>

<p>日期、时间、持续时间的组件提取函数</p>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:dateTime(date,time)</td>
<td>把参数转换为日期和时间。</td>
</tr>

<tr>
<td>fn:years-from-duration(datetimedur)</td>
<td>返回参数值的年份部分的整数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:months-from-duration(datetimedur)</td>
<td>返回参数值的月份部分的整数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:days-from-duration(datetimedur)</td>
<td>返回参数值的天部分的整数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:hours-from-duration(datetimedur)</td>
<td>返回参数值的小时部分的整数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:minutes-from-duration(datetimedur)</td>
<td>返回参数值的分钟部分的整数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:seconds-from-duration(datetimedur)</td>
<td>返回参数值的分钟部分的十进制数，以标准词汇表示法来表示。</td>
</tr>

<tr>
<td>fn:year-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的年部分的整数。</p>
<p>例子：year-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30-04:10&quot;))</p>
<p>结果：2005</p>
</td>
</tr>

<tr>
<td>fn:month-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的月部分的整数。</p>
<p>例子：month-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30-04:10&quot;))</p>
<p>结果：01</p>
</td>
</tr>

<tr>
<td>fn:day-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的天部分的整数。</p>
<p>例子：day-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30-04:10&quot;))</p>
<p>结果：10</p>
</td>
</tr>

<tr>
<td>fn:hours-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的小时部分的整数。</p>
<p>例子：hours-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30-04:10&quot;))</p>
<p>结果：12</p>
</td>
</tr>

<tr> 
<td>fn:minutes-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的分钟部分的整数。</p>
<p>例子：minutes-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30-04:10&quot;))</p>
<p>结果：30</p>
</td>
</tr>

<tr>
<td>fn:seconds-from-dateTime(datetime)</td>
<td>
<p>返回参数本地值的秒部分的十进制数。</p>
<p>例子：seconds-from-dateTime(xs:dateTime(&quot;2005-01-10T12:30:00-04:10&quot;))</p>
<p>结果：0</p>
</td>
</tr>

<tr>
<td>fn:timezone-from-dateTime(datetime)</td>
<td>返回参数的时区部分，如果存在。</td>
</tr>

<tr>
<td>fn:year-from-date(date)</td>
<td>
<p>返回参数本地值中表示年的整数。</p>
<p>例子：year-from-date(xs:date(&quot;2005-04-23&quot;))</p>
<p>结果：2005</p>
</td>
</tr>

<tr>
<td>fn:month-from-date(date)</td>
<td>
<p>返回参数本地值中表示月的整数。</p>
<p>例子：month-from-date(xs:date(&quot;2005-04-23&quot;))</p>
<p>结果：4</p>
</td>
</tr>

<tr>
<td>fn:day-from-date(date)</td>
<td>
<p>返回参数本地值中表示天的整数。</p>
<p>例子：day-from-date(xs:date(&quot;2005-04-23&quot;))</p>
<p>结果：23</p>
</td>
</tr>

<tr>
<td>fn:timezone-from-date(date)</td>
<td>返回参数的时区部分，如果存在。</td>
</tr>

<tr>
<td>fn:hours-from-time(time)</td>
<td>
<p>返回参数本地值中表示小时部分的整数。</p>
<p>例子：hours-from-time(xs:time(&quot;10:22:00&quot;))</p>
<p>结果：10</p>
</td>
</tr>

<tr>
<td>fn:minutes-from-time(time)</td>
<td>
<p>返回参数本地值中表示分钟部分的整数。</p>
<p>例子：minutes-from-time(xs:time(&quot;10:22:00&quot;))</p>
<p>结果：22</p>
</td>
</tr>

<tr>
<td>fn:seconds-from-time(time)</td>
<td>
<p>返回参数本地值中表示秒部分的整数。</p>
<p>例子：seconds-from-time(xs:time(&quot;10:22:00&quot;))</p>
<p>结果：0</p>
</td>
</tr>

<tr>
<td>fn:timezone-from-time(time)</td>
<td>返回参数的时区部分，如果存在。</td>
</tr>

<tr>
<td>fn:adjust-dateTime-to-timezone(datetime,timezone)</td>
<td>如果 timezone 参数为空，则返回没有时区的 dateTime。否则返回带有时区的 dateTime。</td>
</tr>

<tr>
<td>fn:adjust-date-to-timezone(date,timezone)</td>
<td>如果 timezone 参数为空，则返回没有时区的 date。否则返回带有时区的 date。</td>
</tr>

<tr>
<td>fn:adjust-time-to-timezone(time,timezone)</td>
<td>如果 timezone 参数为空，则返回没有时区的 time。否则返回带有时区的 time。</td>
</tr>

</table>




<h3><a id="qname">与 QNames 相关的函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:QName()</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:local-name-from-QName()</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:namespace-uri-from-QName()</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:namespace-uri-for-prefix()</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:in-scope-prefixes()</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:resolve-QName()</td>
<td>&nbsp;</td>
</tr>
</table>




<h3><a id="node">关于节点的函数</a></h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>
<ul>
<li>fn:name()</li>
<li>fn:name(nodeset)</li>
</ul>
</td>
<td>返回当前节点的名称或指定节点集中的第一个节点。</td>
</tr>

<tr>
<td>
<ul>
<li>fn:local-name()</li>
<li>fn:local-name(nodeset)</li>
</ul>
</td>
<td>返回当前节点的名称或指定节点集中的第一个节点 - 不带有命名空间前缀。</td>
</tr>

<tr>
<td>
<ul>
<li>fn:namespace-uri()</li>
<li>fn:namespace-uri(nodeset)</li>
</ul>
</td>
<td>返回当前节点或指定节点集中第一个节点的命名空间 URI。</td>
</tr>

<tr>
<td>fn:lang(lang)</td>
<td>
<p>如果当前节点的语言匹配指定的语言，则返回 true。</p>

<p>例子：Lang(&quot;en&quot;) is true for
&lt;p xml:lang=&quot;en&quot;&gt;...&lt;/p&gt;</p>

<p>例子：Lang(&quot;de&quot;) is false for
&lt;p xml:lang=&quot;en&quot;&gt;...&lt;/p&gt;</p>
</td>
</tr>

<tr>
<td>
<ul>
<li>fn:root()</li>
<li>fn:root(node)</li>
</ul>
</td>
<td>返回当前节点或指定的节点所属的节点树的根节点。通常是文档节点。</td>
</tr>
</table>




<h3><a id="sequence">有关序列的函数</a></h3>

<h3>一般性的函数</h3>

<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>


<tr>
<td>fn:index-of((item,item,...),searchitem)</td>
<td>
<p>返回在项目序列中等于 searchitem 参数的位置。</p>
<p>例子：index-of ((15, 40, 25, 40, 10), 40)</p>
<p>结果：(2, 4)</p>

<p>例子：index-of ((&quot;a&quot;, &quot;dog&quot;, &quot;and&quot;, &quot;a&quot;, &quot;duck&quot;), &quot;a&quot;)</p>
<p>Result (1, 4)</p>

<p>例子：index-of ((15, 40, 25, 40, 10), 18)</p>
<p>结果：()</p>
</td>
</tr>

<tr>
<td>fn:remove((item,item,...),position)</td>
<td>
<p>返回由 item 参数构造的新序列 - 同时删除 position 参数指定的项目。</p>
<p>例子：remove((&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;), 0)</p>
<p>结果：(&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;)</p>

<p>例子：remove((&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;), 1)</p>
<p>结果：(&quot;cd&quot;, &quot;ef&quot;)</p>

<p>例子：remove((&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;), 4)</p>
<p>结果：(&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;)</p>
</td>
</tr>

<tr>
<td>fn:empty(item,item,...)</td>
<td>
<p>如果参数值是空序列，则返回 true，否则返回 false。</p>
<p>例子：empty(remove((&quot;ab&quot;, &quot;cd&quot;), 1))</p>
<p>结果：false</p>
</td>
</tr>

<tr>
<td>fn:exists(item,item,...)</td>
<td>
<p>如果参数值不是空序列，则返回 true，否则返回 false。</p>
<p>例子：exists(remove((&quot;ab&quot;), 1))</p>
<p>结果：false</p>
</td>
</tr>

<tr>
<td>fn:distinct-values((item,item,...),collation)</td>
<td>
<p>返回唯一不同的值。</p>
<p>例子：distinct-values((1, 2, 3, 1, 2))</p>
<p>结果：(1, 2, 3)</p>
</td>
</tr>

<tr>
<td>fn:insert-before((item,item,...),pos,inserts)</td>
<td>
<p>返回由 item 参数构造的新序列 - 同时在 pos 参数指定位置插入 inserts 参数的值。</p>
<p>例子：insert-before((&quot;ab&quot;, &quot;cd&quot;), 0, &quot;gh&quot;)</p>
<p>结果：(&quot;gh&quot;, &quot;ab&quot;, &quot;cd&quot;)</p>

<p>例子：insert-before((&quot;ab&quot;, &quot;cd&quot;), 1, &quot;gh&quot;)</p>
<p>结果：(&quot;gh&quot;, &quot;ab&quot;, &quot;cd&quot;)</p>

<p>例子：insert-before((&quot;ab&quot;, &quot;cd&quot;), 2, &quot;gh&quot;)</p>
<p>结果：(&quot;ab&quot;, &quot;gh&quot;, &quot;cd&quot;)</p>

<p>例子：insert-before((&quot;ab&quot;, &quot;cd&quot;), 5, &quot;gh&quot;)</p>
<p>结果：(&quot;ab&quot;, &quot;cd&quot;, &quot;gh&quot;)</p>
</td>
</tr>

<tr>
<td>fn:reverse((item,item,...))</td>
<td>
<p>返回指定的项目的颠倒顺序。</p>
<p>例子：reverse((&quot;ab&quot;, &quot;cd&quot;, &quot;ef&quot;))</p>
<p>结果：(&quot;ef&quot;, &quot;cd&quot;, &quot;ab&quot;)</p>

<p>例子：reverse((&quot;ab&quot;))</p>
<p>结果：(&quot;ab&quot;)</p>
</td>
</tr>

<tr>
<td>fn:subsequence((item,item,...),start,len)</td>
<td>
<p>返回 start 参数指定的位置返回项目序列，序列的长度由 len 参数指定。第一个项目的位置是 1。</p>

<p>例子：subsequence(($item1, $item2, $item3,...), 3)</p>
<p>结果：($item3, ...)</p>

<p>例子：subsequence(($item1, $item2, $item3, ...), 2, 2)</p>
<p>结果：($item2, $item3)</p>
</td>
</tr>

<tr>
<td>fn:unordered((item,item,...))</td>
<td>依据实现决定的顺序来返回项目。</td>
</tr>
</table>


<h3>测试序列容量的函数</h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:zero-or-one(item,item,...)</td>
<td>如果参数包含零个或一个项目，则返回参数，否则生成错误。</td>
</tr>

<tr>
<td>fn:one-or-more(item,item,...)</td>
<td>如果参数包含一个或多个项目，则返回参数，否则生成错误。</td>
</tr>

<tr>
<td>fn:exactly-one(item,item,...)</td>
<td>如果参数包含一个项目，则返回参数，否则生成错误。</td>
</tr>
</table>


<h3>Equals, Union, Intersection and Except </h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:deep-equal(param1,param2,collation)</td>
<td>如果 param1 和 param2 与彼此相等（deep-equal），则返回 true，否则返回 false。</td>
</tr>
</table>


<h3>合计函数</h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:count((item,item,...))</td>
<td>返回节点的数量。</td>
</tr>

<tr>
<td>fn:avg((arg,arg,...))</td>
<td>
返回参数值的平均数。
例子：avg((1,2,3))
结果：2
</td>
</tr>

<tr>
<td>fn:max((arg,arg,...))</td>
<td>
返回大于其它参数的参数。
例子：max((1,2,3))
结果：3

例子：max(('a', 'k'))
结果：'k'
</td>
</tr>

<tr>
<td>fn:min((arg,arg,...))</td>
<td>
返回小于其它参数的参数。
例子：min((1,2,3))
结果：1

例子：min(('a', 'k'))
结果：'a'
</td>
</tr>

<tr>
<td>fn:sum(arg,arg,...)</td>
<td>返回指定节点集中每个节点的数值的总和。</td>
</tr>
</table>


<h3>生成序列的函数</h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:id((string,string,...),node)</td>
<td>Returns a sequence of element nodes that have an ID value equal to the value of one or more of the values specified in the string argument</td>
</tr>

<tr>
<td>fn:idref((string,string,...),node)</td>
<td>Returns a sequence of element or attribute nodes that have an IDREF value equal to the value of one or more of the values specified in the string argument</td>
</tr>

<tr>
<td>fn:doc(URI)</td>
<td>&nbsp;</td>
</tr>

<tr>
<td>fn:doc-available(URI)</td>
<td>如果 doc() 函数返回文档节点，则返回 true，否则返回 false。</td>
</tr>

<tr>
<td>
<ul>
<li>fn:collection()</li>
<li>fn:collection(string)</li>
</ul>
</td>
<td>&nbsp;</td>
</tr>
</table>




<h3><a id="context">上下文函数</a></h3>
<table class="reference">
<tr>
<th style="width:40%">名称</th>
<th style="width:60%">说明</th>
</tr>

<tr>
<td>fn:position()</td>
<td>
<p>返回当前正在被处理的节点的 index 位置。</p>

<p>例子：//book[position()&lt;=3]</p>
<p>结果：选择前三个 book 元素 </p>
</td>
</tr>

<tr>
<td>fn:last()</td>
<td>
<p>返回在被处理的节点列表中的项目数目。</p>
<p>例子：//book[last()]</p>
<p>结果：选择最后一个 book 元素</p>
</td>
</tr>

<tr>
<td>fn:current-dateTime()</td>
<td>返回当前的 dateTime（带有时区）。</td>
</tr>

<tr>
<td>fn:current-date()</td>
<td>返回当前的日期（带有时区）。</td>
</tr>

<tr>
<td>fn:current-time()</td>
<td>返回当前的时间（带有时区）。</td>
</tr>

<tr>
<td>fn:implicit-timezone()</td>
<td>返回隐式时区的值。</td>
</tr>

<tr>
<td>fn:default-collation()</td>
<td>返回默认对照的值。</td>
</tr>

<tr>
<td>fn:static-base-uri()</td>
<td>返回 base-uri 的值。</td>
</tr>
</table>
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  -webkit-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
     -moz-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
      -ms-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
       -o-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
          box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
}
.tooltip a {
	color:#fff;
}
/* This bridges the gap so you can mouse into the tooltip without it disappearing */
.wrapper .tooltip:before {
  bottom: -20px;
  content: " ";
  display: block;
  height: 20px;
  left: 0;
  position: absolute;
  width: 100%;
}  

/* CSS Triangles - see Trevor's post */
.wrapper .tooltip:after {
  border-left: solid transparent 10px;
  border-right: solid transparent 10px;
  border-top: solid #96b97d 10px;
  bottom: -10px;
  content: " ";
  height: 0;
  left: 20%;
  margin-left: -13px;
  position: absolute;
  width: 0;
}
.wrapper .tooltip1 {
	margin-left: 50px;
	padding-top: 0px;
}
/*
.wrapper:hover .tooltip {
  opacity: 1;
  pointer-events: auto;
  -webkit-transform: translateY(0px);
     -moz-transform: translateY(0px);
      -ms-transform: translateY(0px);
       -o-transform: translateY(0px);
          transform: translateY(0px);
}
*/
/* IE can just show/hide with no transition */
.lte8 .wrapper .tooltip {
  display: none;
}

.lte8 .wrapper:hover .tooltip {
  display: block;
}

</style>

<link rel="stylesheet" href="../0/upvotejs.css">
<script src=""></script>
<script src=""></script>
<div id="respond" class="no_webshot"> 
		<div class="comment-signarea" style=" padding: 20px 20px;"> 
	<h3 class="text-muted" id="share_code" style="color: #799961;"><i class="fa fa-pencil-square-o" aria-hidden="true"></i> 点我分享笔记</h3>
	<!--
	<p style="font-size:14px;">笔记需要是本篇文章的内容扩展！</p><br>
	<p style="font-size:12px;"><a href="../tougao" target="_blank">文章投稿，可点击这里</a></p>
	<p style="font-size:14px;"><a href="../w3cnote/runoob-user-test-intro.html#invite" target="_blank">注册邀请码获取方式</a></p>
		<h3 class="text-muted"><i class="fa fa-info-circle" aria-hidden="true"></i> 分享笔记前必须<a href="javascript:;" class="runoob-pop">登录</a>！</h3>
		<p><a href="../w3cnote/runoob-user-test-intro.html#invite" target="_blank">注册邀请码获取方式</a></p>-->
	</div>
		
	<form action="/wp-content/themes/runoob/option/addnote.php" method="post" id="commentform" style="display:none;">
		<div class="comt">
			<div class="comt-title">
				<i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i>				<p><a id="cancel-comment-reply-link" href="javascript:;">取消</a></p>
			</div>
			<div class="comt-box">
			<div id="mded"></div>
			
				<div class="comt-ctrl">
					<div class="comt-tips"><input type='hidden' name='comment_post_ID' value='3263' id='comment_post_ID' />
<input type='hidden' name='comment_parent' id='comment_parent' value='0' />
</div>
					<button type="submit" name="submit" id="submit" tabindex="5"><i class="fa fa-pencil" aria-hidden="true"></i> 分享笔记</button>
				</div>
			</div>
		
				
					<div class="comt-comterinfo"> 
						<ul id="comment-author-info">
							<li class="form-inline"><label class="hide" for="author">昵称</label><input class="ipt" type="text" name="author" id="author" value="" tabindex="2" placeholder="昵称"><span class="text-muted">昵称 (必填)</span></li>
							<li class="form-inline"><label class="hide" for="email">邮箱</label><input class="ipt" type="text" name="email" id="email" value="" tabindex="3" placeholder="邮箱"><span class="text-muted">邮箱 (必填)</span></li>
							<li class="form-inline"><label class="hide" for="url">引用地址</label><input class="ipt" type="text" name="url" id="url" value="" tabindex="4" placeholder="引用地址"><span class="text-muted">引用地址</span></li>
						</ul>
					</div>
				
			
		</div>

	</form>
	</div>
<script type="text/javascript">
$(function() {
	//初始化编辑器
	
	var editor = new Simditor({
	  textarea: $('#mded'),
	  placeholder: '写笔记...',
	  upload:false,
	 // upload: {url:'/api/comment_upload_file.php',params: null,fileKey: 'upload_file',connectionCount: 1,leaveConfirm: '文件正在上传，您确定离开?'},
	  defaultImage: 'https://www.runoob.com/images/logo.png',
	  codeLanguages: '',
	  autosave: 'editor-content',
	  toolbar: [  'bold','code','ul','ol','image' ]
	});
	editor.on('selectionchanged', function() {
		$(".code-popover").hide();
	});

	// 提交数据
	$("#share_code").click(function() {
		$(".comment-signarea").hide();
		$("#commentform").show();
		
	});
	$("#user_add_note").click(function() {
		$(".comment-signarea").hide();
		$("#commentform").show();
		$('html, body').animate({
       	    scrollTop: $("#respond").offset().top
    	}, 200);
	});

	// 提交笔记
	var commentform=$('#commentform');
	commentform.prepend('<div id="comment-status" style="display:none;" ></div>');
	var statusdiv=$('#comment-status');
	
	commentform.submit(function(e){
		e.preventDefault();
		var noteContent = editor.getValue();
		// console.log(noteContent);
		noteContent = noteContent.replace(/<pre><code>/g,"<pre>");
		noteContent = noteContent.replace(/<\/code><\/pre>/g,"</pre>");
		
		// 系列化表单数据
		var comment_parent = 0;
		var is_user_logged_in = $("#is_user_logged_in").val();
		var comment_post_ID =  3263;
		var _wp_unfiltered_html_comment = $("#_wp_unfiltered_html_comment").val();
		var comment = noteContent;
		var author = $("#author").val();
		var url = $("#url").val();
		var email = $("#email").val();
		if(isBlank(author) && is_user_logged_in==0) {
			statusdiv.html('<p  class="ajax-error">请输入昵称！</p>').show();
		} else if(isBlank(email)  && is_user_logged_in==0) {
			statusdiv.html('<p  class="ajax-error">请输入邮箱！</p>').show();
		} else {
			// var formdata=commentform.serialize() + "&comment=" + noteContent ;
			// 添加状态信息
			statusdiv.html('<p>Processing...</p>').show();
			// 获取表单提交地址
			var formurl=commentform.attr('action');
			
			// 异步提交
			$.ajax({
					type: 'post',
					url: formurl,
					dataType:'json',
					data: {"comment_parent":comment_parent,"comment_post_ID":comment_post_ID, "_wp_unfiltered_html_comment":_wp_unfiltered_html_comment,"comment":comment,"url":url, "email":email,"author":author},
					error: function(XMLHttpRequest, textStatus, errorThrown){
					statusdiv.html('<p class="ajax-error" >数据不完整或表单提交太快了！</p>').show();
				},
				success: function(data, textStatus){
					if(data.errorno=="0") {
						$("#submit").prop('disabled', true);
						statusdiv.html('<p class="ajax-success" >笔记已提交审核，感谢分享笔记！</p>').show();
						alert('笔记已提交审核，感谢分享笔记！');
					}else{
						statusdiv.html('<p class="ajax-error" >'+data.msg+'</p>').show();
					}
					commentform.find('textarea[name=comment]').val('');
				}
			});
			setTimeout(function(){
		        $("#submit").prop('disabled', false);
		    }, 10*1000);
		}
		return false;

	});
	$(".comt-author").click(function() {
		href = $(this).children("a").attr("href");
		if(href.indexOf("/note/")!=-1) {
			var win = window.open(href, '_blank');
  			win.focus();
		}
	});
	$(".comt-meta span").hover(function(){
		$(this).children(".tooltip").css({ "opacity": 1, "pointer-events": "auto"});
	},function(){
		$(this).children(".tooltip").removeAttr("style");
	});
	/*
	$(".wrapper i").hover(function(){
		$(this).siblings(".tooltip").css({ "opacity": 1, "pointer-events": "auto"});
	},function(){
		$(this).siblings(".tooltip").css({ "opacity": 0, "pointer-events": "auto"});
	});
	*/
	//Upvote.create('runoobvote-id', {callback: vote_callback});
	var ajaxurl = 'https://www.runoob.com/wp-admin/admin-ajax.php';
	var callback = function(data) {
		//console.log($('#runoobvote-id').upvote('upvoted'));
		//console.log($('#runoobvote-id').upvote('downvoted'));
		//console.log(data);
		_vote_action = data.action;
		id_arr = data.id.split('-');
		um_id= id_arr[2];
		//console.log(um_id);
		
		var re = /^[1-9]+/;
		if (re.test(um_id)) { 
			var ajax_data = {
				_vote_action: _vote_action,
				action: "pinglun_zan",
				um_id: um_id,
				um_action: "ding"
			};
			//console.log(ajax_data);
			$.post(ajaxurl,ajax_data,function(status){
				//if(status.vote_num>999) {
				//	_voteHtml = '<span style="display: block; text-align: center;font-size: 20px; color: #6a737c; margin: 8px 0;">'+kFormatter(status.vote_num) +'</span>';
				//	$("#runoobvote-id-" + um_id + " .count").hide().after(_voteHtml);
				//}
				
			});
		}
	};
	if($('#comments').length && $('.upvotejs').length){
		$('.upvotejs').upvote({id: 3263, callback: callback});
	
		$.post(ajaxurl,{"action":"pinglun_zan","postid":3263},function(data){  
			$(data).each(function(key,value) {
				$("#runoobvote-id-" + value.commid + " .upvote").addClass(value.upvotejs_class);
				$("#runoobvote-id-" + value.commid + " .downvote").addClass(value.downvote_class);
				$("#runoobvote-id-" + value.commid + " .count").text(value.upvote_count);
			})
		},'json');
		
	}
	
	
});
function isBlank(str) {
    return (!str || /^\s*$/.test(str));
}
function kFormatter(num) {
	// return num;
    return Math.abs(num) > 999 ? Math.sign(num)*((Math.abs(num)/1000).toFixed(1)) + 'k' : Math.sign(num)*Math.abs(num)
}

</script>

<link rel="stylesheet" href="../0/qa.css?1.44">
<link rel="stylesheet" type="text/css" href="../0/simditor.min.css" />
<script type="text/javascript" src=""></script>
<script type="text/javascript" src=""></script>
<script type="text/javascript" src=""></script>
<script type="text/javascript" src=""></script>
<script type="text/javascript" src=""></script>
		<div class="sidebar-box ">
				

<style>	
.responsive_ad1 { display:none; }
@media(min-width: 800px) { .responsive_ad1 {  display:block;margin:0 auto;} }
</style>
<div id="ad-336280" >

<script async src=""
     crossorigin="anonymous"></script>
<!-- 移动版 自动调整 -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-5751451760833794"
     data-ad-slot="1691338467"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>
		</div>
				</div>
		
	</div>
</div>
	

<!-- 右边栏 -->
<div class="fivecol last right-column">

<style>
.sidebar-tree .double-li {
    width:300px;
}
.sidebar-tree .double-li li {
    width: 44%;
    line-height: 1.5em;
    border-bottom: 1px solid #ccc;
    float: left;
    display: inline;
}
</style>

    
        <div class="sidebar-box re-box re-box-large">
        <div class="sidebar-box recommend-here" style="margin: 0 auto;">
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    <div class="sidebar-box sidebar-cate">
        
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